OR-814 Add attachments reference on message POST
OR-814 Add referenced in file metadata when posting a message which contains file references in attachments
Merge pull request #573 in OR/rse from OR/rse-chamerling:OR-814-reference-metadata to master

* commit '666c1255deb064bc2986e656898aed225d158992':
  OR-814 Add referenced in file metadata when posting a message which contains file references in attachments
  OR-814 Add attachments reference on message POST